immense

An immense thing or experience is extremely big or impressive, so much so that it's hard to believe or imagine. Think of something as huge and massive.

When we talk about something being immense, we often mean that it's enormous in size or scope. For example, "The Grand Canyon is an immense natural wonder" means that it's incredibly large and awe-inspiring. We might also use the word when describing a great challenge or task - like "Learning a new language can be an immense undertaking." In this case, we're not just talking about its size, but also how much time, effort, and dedication is required to accomplish something so big.